Given the following cost and activity observations for Bounty Company's utilities, use the high-low method to determine Bounty's variable utilities cost per machine hour. Round your answer to the nearest cent.

	Cost	Machine Hours
March	$3,115	14,933
April	2,660	9,715
May	2,891	11,635
June	3,899	17,852

a.$0.72

b.$1.83

c.$0.15

d.$0.76